Filtering balanced-to-single-ended power divider with arbitrary power division ratio

In this paper, a filtering balanced-to-single-ended power divider with arbitrary power division ratio is proposed, which is realized by the coupling structures and the microstrip lines with specific impedance requirement. Benefitting from the structure, the fused function of arbitrary differential-mode power dividing, common-mode suppression and filtering can be achieved. For demonstration, a prototype with the ratio (1:2) is implemented. The measured results exhibit the minimum insertion loss of 1.6 dB with a 1-dB bandwidth of 3.8%.